Causality, unitarity and stability in quantum gravity: a non-perturbative perspective

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Causality, unitarity and stability in quantum gravity : a non-perturbative perspective. / Platania, Alessia.

I: Journal of High Energy Physics, Bind 2022, Nr. 9, 167, 09.2022.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Platania, A 2022, 'Causality, unitarity and stability in quantum gravity: a non-perturbative perspective', Journal of High Energy Physics, bind 2022, nr. 9, 167. https://doi.org/10.1007/JHEP09(2022)167

APA

Platania, A. (2022). Causality, unitarity and stability in quantum gravity: a non-perturbative perspective. Journal of High Energy Physics, 2022(9), [167]. https://doi.org/10.1007/JHEP09(2022)167

Vancouver

Platania A. Causality, unitarity and stability in quantum gravity: a non-perturbative perspective. Journal of High Energy Physics. 2022 sep.;2022(9). 167. https://doi.org/10.1007/JHEP09(2022)167

Author

Platania, Alessia. / Causality, unitarity and stability in quantum gravity : a non-perturbative perspective. I: Journal of High Energy Physics. 2022 ; Bind 2022, Nr. 9.

Bibtex

@article{40201088c371415fba28e11d58b55e45,
title = "Causality, unitarity and stability in quantum gravity: a non-perturbative perspective",
abstract = "Resumming quantum fluctuations at the level of the gravitational path integral is expected to result in non-local effective actions and thus in a non-trivial momentum dependence of the propagator. Which properties the (dressed) graviton propagator has to satisfy and whether they can all be met are key open questions. In this work we present criteria and conditions for the momentum dependence of a graviton propagator which is consistent with unitarity, causality, and stability in a non-perturbative setting. To this end, we revisit several aspects of these conditions, highlighting some caveats and subtleties that got lost in recent discussions, and spelling out others that to our best knowledge have not been studied in detail. We discuss the consequences of these concepts for the properties of the graviton propagator. Finally, we provide examples of propagators satisfying unitarity and causality, while avoiding tachyonic and vacuum instabilities, and allowing for an analytic Wick rotation.",
keywords = "Effective Field Theories, Nonperturbative Effects, Renormalization and Regularization, Renormalization Group",
author = "Alessia Platania",
note = "Publisher Copyright: {\textcopyright} 2022, The Author(s).",
year = "2022",
month = sep,
doi = "10.1007/JHEP09(2022)167",
language = "English",
volume = "2022",
journal = "Journal of High Energy Physics (Online)",
issn = "1126-6708",
publisher = "Springer",
number = "9",

}

RIS

TY - JOUR

T1 - Causality, unitarity and stability in quantum gravity

T2 - a non-perturbative perspective

AU - Platania, Alessia

N1 - Publisher Copyright: © 2022, The Author(s).

PY - 2022/9

Y1 - 2022/9

N2 - Resumming quantum fluctuations at the level of the gravitational path integral is expected to result in non-local effective actions and thus in a non-trivial momentum dependence of the propagator. Which properties the (dressed) graviton propagator has to satisfy and whether they can all be met are key open questions. In this work we present criteria and conditions for the momentum dependence of a graviton propagator which is consistent with unitarity, causality, and stability in a non-perturbative setting. To this end, we revisit several aspects of these conditions, highlighting some caveats and subtleties that got lost in recent discussions, and spelling out others that to our best knowledge have not been studied in detail. We discuss the consequences of these concepts for the properties of the graviton propagator. Finally, we provide examples of propagators satisfying unitarity and causality, while avoiding tachyonic and vacuum instabilities, and allowing for an analytic Wick rotation.

AB - Resumming quantum fluctuations at the level of the gravitational path integral is expected to result in non-local effective actions and thus in a non-trivial momentum dependence of the propagator. Which properties the (dressed) graviton propagator has to satisfy and whether they can all be met are key open questions. In this work we present criteria and conditions for the momentum dependence of a graviton propagator which is consistent with unitarity, causality, and stability in a non-perturbative setting. To this end, we revisit several aspects of these conditions, highlighting some caveats and subtleties that got lost in recent discussions, and spelling out others that to our best knowledge have not been studied in detail. We discuss the consequences of these concepts for the properties of the graviton propagator. Finally, we provide examples of propagators satisfying unitarity and causality, while avoiding tachyonic and vacuum instabilities, and allowing for an analytic Wick rotation.

KW - Effective Field Theories

KW - Nonperturbative Effects

KW - Renormalization and Regularization

KW - Renormalization Group

UR - http://www.scopus.com/inward/record.url?scp=85141084798&partnerID=8YFLogxK

U2 - 10.1007/JHEP09(2022)167

DO - 10.1007/JHEP09(2022)167

M3 - Journal article

AN - SCOPUS:85141084798

VL - 2022

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

SN - 1126-6708

IS - 9

M1 - 167

ER -

ID: 388512933